Animatable layouts, FlexScrollView & widgets for famo.us
npm install famous-flexAnimatable layouts, FlexScrollView & widgets for famo.us.
Above anything, famous-flex is a concept in which renderables are seperated from how
they are layed-out. This makes it possible to change layouts on the fly and animate
the renderables from one layout to another. For instance, you can layout a collection
of renderables using a CollectionLayout, and change that into a ListLayout. When usingflow-mode the renderables will smoothly transition from the old state to the new state using physics, particles and springs.
Many people have asked me what the future of famous-flex holds, and I would like to shed some light on this..
I've been working on a big update to famous-flex for some time now. Initially it was to be based on the mixed-mode release of famo.us, but this doesn't seem future proof at the moment. It will therefore be based on (or rather run on top of) famous v3 and Samsara.js. The new library shall contain an extensive set of out-of-the-box controls such as a switch, slider, progress-bar, label, tab-bar, scrollview, etc... All controls will be highly customizable and highly animatable. The idea here is to have a complete and solid set of building blocks for quickly building web/apps.
A second goal will be to use famous-flex as an output target for NativeScript apps. Using NativeScript it is possible to write native apps (iOS/Android) using the power of javascript. How awesome would it be to be able to run these apps in the browser as well. I have clear use cases for this and my customers would benefit from this. I want the ability to be able to write a mobile app and website using a shared code-base, and have native performance characteristics for the mobile apps.
All the best, IjzerenHein
- famous-flex-demo (source)
- AnimationController demo (source)
- Chat demo (source)
- DatePicker demo (source)
- TabBar demo (source)
- TabBarController demo (source)
Install using bower or npm:
bower install famous-flex
npm install famous-flex
LayoutController is a view that lays out renderables based on:
- a layout-function
- a data-source containing renderables
- optional layout-options
Example of laying out renderables using a CollectionLayout:
``javascript
var LayoutController = require('famous-flex/LayoutController');
var CollectionLayout = require('famous-flex/layouts/CollectionLayout'); // import standard layout
// create collection-layout
var layoutController = new LayoutController({
layout: CollectionLayout,
layoutOptions: {
itemSize: [100, 100],
gutter: [20, 20],
justify: true
},
flow: true, // smoothly animates renderables when changing the layout
direction: 1, // 0 = X, 1 = Y, undefined = use default from selected layout-function
dataSource: [
new Surface({content: 'surface1'}),
new Surface({content: 'surface2'}),
new Surface({content: 'surface3'})
]
});
this.add(layoutController); // add layout-controller to the render-tree
`
When the flow option is enabled, renderables are animated smoothly between
layout states.
A layout is represented as a Function, which takes a context argument andoptions
an optional argument. The purpose of the function is to lay-out thecontext.set()
renderables in the data-source by calling on a renderable. Thecontext.next()
renderables can be enumerated by calling , context.prev() or
by using the id of the renderable.
Famous-flex comes shipped with various standard layouts, but
it is also very easy to create your own layout-functions.
View LayoutContext for more details on creating your own
layout-functions.
`javascript
/**
* @param {LayoutContext} context Context used for enumerating renderables and setting the layout
* @param {Object} [options] additional layout-options that are passed to the function
*/
function LayoutFunction(context, options) {
// simple layout-function that lays out renderables from top to bottom
var node = context.next();
var y = 0;
while (node) {
context.set(node, {
size: [context.size[0], 100],
translate: [0, y, 0]
});
y += 100;
node = context.next();
}
};
`
For optimal performance, the layout function is only executed when:
- A resize occurs
- An option is changed on the layout-controller
- When the content is scrolled
The data-source contains the renderables that are to be layed-out.
It can be one of three things:
- An Array
- A
- A
- An with key/value pairs
In case of an Array or a ViewSequence, use context.next() in your
layout-function to enumerate all the renderables in the data-source:
`javascript`
var layoutController = new LayoutController({
layout: function (context, options) {
var y = 0;
var node = context.next();
while (node) {
context.set(node, {
size: [context.size[0], 100],
translate: [0, y, 0]
});
y += 100;
node = context.next();
}
},
dataSource: [
new Surface({content: 'surface1'}),
new Surface({content: 'surface2'}),
new Surface({content: 'surface3'})
]
});
Sometimes it is easier to identify renderables by an id, rather than a
sequence. In that case use context.get() or directly pass the data-source idcontext.set()
to the function:
`javascript`
var layoutController = new LayoutController({
layout: function (context, options) {
context.set('one', {
size: [100, 100],
translate: [0, 0, 0]
});
context.set('two', {
size: [100, 100],
translate: [100, 0, 0]
});
context.set('three', {
size: [100, 100],
translate: [200, 0, 0]
});
},
dataSource: {
'one': new Surface({content: 'one'}),
'two': new Surface({content: 'two'}),
'three': new Surface({content: 'three'})
}
});
Layout literals are objects which describe layouts through a definition rather
than a function. The following example describes the use of a layout literal
using dock semantics (see LayoutDockHelper):
`javascript`
var layoutController = new LayoutController({
layout: {dock: [
['top', 'header', 50],
['bottom', 'footer', 50],
['fill', 'content']
]},
dataSource: {
header: new Surface({content: 'Header'}),
footer: new Surface({content: 'Footer'}),
content: new Surface({content: 'Content'})
}
});
Layout literals are implemented through LayoutHelpers. To create your own
layout literals, perform the following steps:
- Create a LayoutHelper (see LayoutDockHelper for an example).
- Implement the parse function on the LayoutHelper.LayoutUtility.registerHelper
- Register the helper using .
Layout helpers are special classes that simplify writing layout functions.
|Helper|Literal|Description|
|---|---|---|
|LayoutDockHelper|dock`|Layout renderables using docking semantics.|
|Layout|DataSource|Scrollable|Description|
|---|---|---|---|
|ProportionalLayout|LinkedListViewSequence / Array|No|Lays out renderables sequentially and sizes them proportionally.|
|HeaderFooterLayout|Id-based|No|Layout containing a top-header, bottom- footer and content.|
|NavBarLayout|Id-based|No|Layout containing one or more left and right items and a title.|
|TabBarLayout|Id-based|No|Tab-bar layout.|
|Scrollable layouts:|
|ListLayout|LinkedListViewSequence / Array|Yes|List layout with margins, spacing and optionally sticky headers.|
|CollectionLayout|LinkedListViewSequence / Array|Yes|Lays out renderables in a grid with a specific width & height.|
|WheelLayout|LinkedListViewSequence / Array|Yes|Lays out renderables in a wheel (slot-machine) formation.|
|CoverLayout|LinkedListViewSequence / Array|Yes|Lays out renderables in a wheel (slot-machine) formation.|
|Class|Description|
|---|---|
|LayoutController|Lays out renderables and optionally animates between layout states.|
|AnimationController|Animating between famo.us views in awesome ways.|
|ScrollController|Scrollable LayoutController (base class for FlexScrollView).|
|FlexScrollView|Flexible scroll-view with pull-to-refresh, margins & spacing and more good stuff.|
|DatePicker|Date/time picker wheel.|
|TabBar|TabBar widget.|
|TabBarController|TabBarController widget.|
|LayoutContext|Context used for writing layout-functions.|
|LayoutUtility|Utility class containing helper functions.|
|VirtualViewSequence|Infinite view-sequence which uses a factory delegate to create renderables.|
|LinkedListViewSequence|Linked-list based View-sequence which resolves various issues with the stock famo.us ViewSequence.|
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© 2014 - 2016 Hein Rutjes